Centrifugal compressor having lubricant distribution system

1. A compressor, comprising:

a gear box;

a rotor assembly including a rotor; and

a bearing of the rotor assembly including a radial bearing pad and a stationary thrust bearing, comprising:

a lubricant entry port extending radially inward from an outer wall of the bearing;

a first lubricant flow path extending from the entry port configured to flow a first lubricant flow to a first bearing surface of the bearing between the rotor and the radial bearing pad;

a second lubricant flow path extending from the entry port separate from the first lubricant flow path and configured to flow a second lubricant flow to a second bearing surface of the bearing between the rotor and the thrust bearing; and

wherein the first lubricant flow path and the second lubricant flow path merge together after exiting from first and second exit flow paths formed from at least portions of the thrust bearing.

2. The compressor of claim 1 , further comprising:

a first exit flow port formed in a portion of the thrust bearing in fluid communication with the first flow path;

an annular ring formed in the bearing downstream of the second lubricant flow path and adjacent the thrust bearing; and

wherein a second exit flow port is in fluid communication with the annular ring and extends between the thrust bearing and the rotor.

3. A system, comprising:

a main bearing;

a thrust bearing disposed adjacent to the main bearing;

a first lubricant flow path extending from a lubricant entry port of the main bearing to a first bearing surface between the main bearing and a rotor;

a second lubricant flow path separate from the first lubricant flow path extending from the lubricant entry port of the main bearing to a second bearing surface between the thrust bearing and the rotor;

wherein the first lubricant flow path extends from the lubricant entry port radially through the main bearing and into a journal cavity of the main bearing;

wherein the first bearing surface comprises a surface between a bearing pad disposed within the journal cavity and the rotor;

wherein the first lubricant flow path extends from the journal cavity, through an inner cavity of the thrust bearing, and through one of a plurality of first lubricant exit ports extending through the thrust bearing radially outward from the inner cavity; and

wherein lubricant in the first and second flow paths merge downstream of the main bearing and thrust bearing after discharging from the first and second exit ports formed with portions of the thrust bearing.

4. The system of claim 3 , wherein main bearing is configured to receive the rotor of a centrifugal compressor.

5. The system of claim 3 , wherein the second lubricant flow path extends from the lubricant entry port axially through the main bearing and into an annular recess formed in an axial outer surface of the main bearing.

6. The system of claim 5 , wherein the thrust bearing comprises a plurality of axial lubricant ports fluidly coupled to the annular recess, and each of the plurality of axial lubricant ports extends to the second bearing surface.

7. The system of claim 6 , wherein the second bearing surface comprises a surface between the thrust bearing and the rotor.

8. The system of claim 3 , comprising a gear box configured to supply the lubricant to the lubricant entry port.

9. The system of claim 3 , wherein the thrust bearing is removable from the main bearing.

10. A method, comprising:

flowing a first lubricant flow from a lubricant entry port of a main bearing to a first bearing surface of the main bearing adjacent a first rotor surface through a first lubricant flow path;

flowing a second lubricant flow from the lubricant entry port to a second bearing surface of a thrust bearing adjacent a second rotor surface through a second lubricant flow path split off from the first lubricant flow path in the main bearing;

flowing the first lubricant flow from the first bearing surface through a plurality of first exit ports extending radially through the thrust bearing;

flowing the second lubricant flow from the second bearing surface through a second exit port formed with the thrust bearing;

wherein the first lubricant flow path and the second lubricant flow path are separate from one another; and

merging lubricant from the first and second flow paths after exiting through the first and second exit ports.

11. The method of claim 10 , wherein the lubricant entry port is in fluid communication with a gear box of a compressor.

12. The method of claim 11 , wherein the first lubricant flow path extends radially from the lubricant entry port and into a journal cavity of the main bearing, and the second lubricant flow path extends axially from the lubricant entry port and into an annular ring formed in an outer axial surface of the main bearing.

13. The method of claim 12 , comprising flowing the second lubricant flow from the annular ring, through the axial lubricant ports of the thrust bearing, to the second bearing surface.